.container {
  display: flex;
  justify-content: center; /* Horizontally center */
  align-items: center;    /* Vertically center */
  height: 100vh;          /* Example: take full viewport height */
  border: 1px solid #ccc;
}

.item {
  /* Your item styles */
  padding: 20px;
  background-color: lightblue;
  font-family: sans-serif;
}